Fog, Mist, and Haze
The international definition of fog is a visibility of less than 1 kilometre (3,300 ft); mist is a visibility of between 1 kilometre (0.62 mi) and 2 kilometres (1.2 mi) and haze from 2 kilometres (1.2 mi) to 5 kilometres (3.1 mi). Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size; this has implications for sensors such as Thermal Imagers (TI/FLIR) operating in the far-IR at wavelengths of about 10 μm which are better able to penetrate haze and some smokes because their particle size is smaller than the wavelength; the IR radiation is therefore not significantly deflected or absorbed by the particles.
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Famous quotes containing the word haze:
“Here is what sometimes happened to me: after spending the first part of the night at my desk—that part when night trudges heavily uphill—I would emerge from the trance of my task at the exact moment when night had reached the summit and was teetering on that crest, ready to roll down into the haze of dawn....”
—Vladimir Nabokov (1899–1977)